pitch (noun) – how high or low a tone is (in music or acoustics)
pitch-perfect (adjective) – (sound) exactly right
Note: Pitch can have a number of other meanings.
Here are some examples of how you can use pitch:
An alto sings in a low pitch, whilst a soprano sings in a low pitch.
The pitch of her voice is very high, which may be why I find it hard to understand her.
Chinese uses different pitches to express different meanings.
The piano has been tuned and now it sounds pitch-perfect .
The trombonist gave a pitch-perfect concert.